Geotechnical Investigation Report · OPW26/0149

       1             REPORT SCOPE                                                                                                                                                 4
       2             SITE DESCRIPTION                                                                                                                                             4
       3             PROPOSED DEVELOPMENT                                                                                                                                         5
CONTENTS
       4             REGIONAL GEOLOGY                                                                                                                                             6
       5             FIELD INVESTIGATION                                                                                                                                          7
       6        GEOTECHNICAL MODEL                                                                                                                                                7
            6.1    Encountered Strata                                                                                                                                             7
            6.2    Groundwater                                                                                                                                                    8
       7             LABORATORY TESTING AND RESULTS                                                                                                                               8
       8             SLOPE STABILITY ANALYSIS                                                                                                                                     9
       9        GEOTECHNICAL RECOMMENDATIONS                                                                                                                                     11
            9.1    SITE CLASSIFICATION                                                                                                                                           11
            9.2    Earthworks Advice                                                                                                                                             11
             9.2.1 Excavation Conditions                                                                                                                                         11
               9.2.2           Suitability of Site Won Material                                                                                                                  11
               9.2.3           Site Formation Recommendations                                                                                                                   12
               9.2.4               Filling                                                                                                                                      12
               9.2.5           General Dam Construction Advice                                                                                                                  12
               9.2.6           Batter Angles                                                                                                                                    13
            9.3                FOUNDATION RECOMMENDATIONS                                                                                                                       13
            9.4                STORMWATER/WASTEWATER EFFLUENT DISPOSAL                                                                                                          13
            9.5                CONSTRUCTION OBSERVATIONS                                                                                                                        14
       10            LIMITATIONS                                                                                                                                                14

       TABLES
       Table 1: Summary of Material Depths Encountered in Boreholes ...................................................................................8
       Table 2: Summary of Atterberg Limits Testing ......................................................................................................................8
       Table 3: Summary of Shrink-Swell Index Testing ..................................................................................................................8
       Table 4: Summary of Emerson Class Testing..........................................................................................................................9
       Table 5: Summary of CBR Testing .............................................................................................................................................9
       Table 6: Geotechnical parameters utilised in analysis. ..................................................................................................... 10
       Table 7: Summary of Global Stability Analysis. ................................................................................................................... 10
       Table 8: Shallow Pier Allowable Bearing Pressures ............................................................................................................ 13


       APPENDICES

       Appendix            1      Test Location Plan & Borehole Logs

       Appendix            2      Laboratory Testing

       Appendix            3      Slope Stability Analysis Results




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